import termios
tty_file_r = open(u"/dev/ttyS3","r+")
new = termios.tcgetattr(tty_file_r)
new[3] = new[3]&~termios.ECHO
termios.tcsetattr(tty_file_r,termios.TCSADRAIN,new)
while(True):
	print "data",tty_file_r.readline()
